Propeller.



J. R. `FIALA.

PROPELLEB.

APPLICATION FILED 00T. 3, 1910.

Patented Aug. 8, 1911.

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.' DOLUMBIA PLANOP-APH C0.. WASHINBTON, D. C.

J. R. FIALA.

PROPBLLBR.

APPLICATION 1111.31) 001.3, 1910.

999,768, Patented Aug. 8, 1911.

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OLUMIIA PLANOGRAIH WASHINGTON. D. C

I; of Nebraska, have invented a new and useful appertains to make anduse the same.

said changes fall within the scope hereinis an end view. Fig. 6 is afragmentary elewheel 8 meshes with a cog wheel 9 which IINI'ID STATESATEN'I OFFICE.

JOSEF R. FIALA, OF OMAHA, NEBRASKA.

PROPELLER.

To all whom t 'may concern:

Be it known that I, Josnr R. FIALA, a citizen of the United States,residing at Omaha, in the county of Douglas and State Propeller; and Ido hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it The invention relates to propellers and has for itsobject to provide a propeller especially designed where great speed isdesired.

A further object of the invention is to provide propelling mechanism fortwin propellers and so disposed that the propellers may be one or bothdisengaged from the operating mechanism.

A further object of the invention is to provide a propeller of thatclass having a link or rod connecting the extremities of the propeller,thereby relieving the same from part of the strain incident to rapidmotion.

I desire it to be understood that changes in form, proportion andarrangement of parts may be freely resorted to without departing fromthe spirit of this invention or sacrificing any advantages thereof,provided that after claimed.

In the drawings, Figure 1 is a horizontal sectional view through thehull of a vessel, showing my propeller and mechanism for operating thesame applied thereto. Fig. 2 is a side elevation thereof partly insection. Fig. 3 is a front elevation of the twin screw operatingmechanism. Fig. 4 is a plan view of the operating mechanism. Fig. 5

vation, showing one of the propellers out of operation. Fig. 7 is adet-ail horizontal sectional view taken on the line 7 7 of Fig. 3.

Referring to the drawings, 1 designates a drive shaft which is operatedby steam or any other suitable source of power, on which is mounted alarge drive wheel 2. On either side of the drive wheel' 2 is a shaft 3,on which is mounted a small wheel 4 and a larger wheel 5. The smallerwheel 4 meshes with the drive wheel 2 and wheel 5 is operated by theshaft 3 which meshes with the small wheel 6 which is mounted on a shaft7, which shaft carries a larger wheel 8. The

operates a flexible shaft 10, which carries a Specification of LettersPatent.

Patented Aug. 8, 1911.

191e. semi No. 585,041.

propeller 18. The lever 11 is pivoted, as at 12, and the shafts arejournaled in the lower ends of these levers 11. Vhen it is desired todisengage the propeller from the operating mechanism, the screw-threadedmember 13 is unscrewed until the lever 11 is free to move in the space14 between the extremities of the bracket 15, which forms a guide inwhich the lever is operated.

As shown in Fig. 6, the lever 11 is moved inwardly and a screw 13 beinginserted holds the same in an inoperative position. When it is desiredto throw the propeller into engagement with the operating mechanism, thescrew 13 is withdrawn and the lever 11 is moved into a verticalposition, which causes the wheel 9 to mesh with the wheel 8. whichcauses the propellers to operaie.

It will be seen that the screw 13 holds the propeller locked in eitheran operative or inoperative position, as desired.

The propeller shafts 10 pass through suitable stuiiing boxes 16, throughwhich said shafts project into the water. Each of the propeller shafts10 is supported by an arm 17, through the lower portions of which theshafts extend.

In order to relieve the propeller from some of the strain incident torapid movement, rods or braces 19 are provided which connect the outerends of each of the propellers.

It will be seen that my invention is simple, inexpensive and durable andthat exceedingly great speed can be developed when desired. Thispropeller can be used on the sides of the boats, if desired, single ordouble.

Having described the invention, what I claim as new and useful anddesire to secure by Letters Patent is 1. In a propelling mechanism ofthe class described, a pair of propelling shafts, one end of each shaftbeing mounted in a lever, a cog wheel carried by each shaft, means foroperating said wheels, a substantially U- shaped bracket for thereception of the upper end of the lever, said bracket acting as aguideway for the operation of said lever whereby the propellers arethrown into and out of engagement, said bracket being provided with ascrew threaded locking member penetrating the bracket, for holding thelever in either of two different positions, substantially as and for thepurpose described.

2. In combination, a frame including a revoluble chain of gears,arranged in the hull of a boat, a pair of flexible propeller shaftsournaled in bearings in the stern of the boat and. each provided with agear wheel on one of its ends, a pair of levers, one pivoted on eachside of said frame, in Jthe lower short end of which levers t-he ends ofthe propeller-shafts are journaled, U-shaped metallic strap bracketsarching over the upper portions of the levers and bolted to the frame,and a locking plug having a restricted portion threaded through each ofthe brackets, the restricted portions of the plugs constituting meansfor holding the levers against one side or the other of the inside ofthe brackets, whereby the gears of the propeller shafts may be held inor out of mesh with two of the gears of the chain of gears, the leversbeing permitted to be moved by unscrewing the locking plugs. r Intestimony whereof I have signed my name to this specication in thepresence of two subscribing witnesses.

J @SEF R. FIALA. Vitne sses JOSEF KUDLAI, FR. J. FIALA.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C.

